10. Tom Araya
Bands: Slayer (1982-present)
You all should already know how great Tom Araya is. In my opinion Tom is the greatest thrash vocalist of all time. He's the guy the singers of all up and coming thrash bands aspire to be. His sinister delivery and high pitched screams are a big part of what made Slayer stand out above the rest. In the 90's his vocal style became more angry and pissed off sounding and he was damn good at that too. At age 50 his voice isn't quite what is was on Reign in Blood (his vocal peak IMO) but he's still brings it live and on record.
Example: Angel of Death
(hands down the greatest scream of all time)